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Bug 1710751 - splice write does not update file size
Summary: splice write does not update file size
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: kernel
Version: 7.7
Hardware: All
OS: All
Target Milestone: rc
: 7.8
Assignee: Yan, Zheng
QA Contact: Hemanth Kumar
John Wilkins
Depends On:
TreeView+ depends on / blocked
Reported: 2019-05-16 08:59 UTC by Yan, Zheng
Modified: 2020-04-24 13:18 UTC (History)
10 users (show)

Fixed In Version: kernel-3.10.0-1114.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Last Closed: 2020-03-31 19:18:03 UTC
Target Upstream Version:

Attachments (Terms of Use)

System ID Private Priority Status Summary Last Updated
Ceph Project Bug Tracker 39938 0 None None None 2019-05-16 08:59:21 UTC
Red Hat Product Errata RHSA-2020:1016 0 None None None 2020-03-31 19:20:33 UTC

Description Yan, Zheng 2019-05-16 08:59:21 UTC
Description of problem:

ceph_file_splice_write does not mark Fw cap dirty. File size update gets lost.

How reproducible:
1. use splice(2) to write data to a file from one cephfs mount
2. stat the file from another cephfs mount. stat will show file size does not change.

Comment 14 Jan Stancek 2019-11-26 09:15:57 UTC
Patch(es) committed on kernel-3.10.0-1114.el7

Comment 17 Yan, Zheng 2020-03-05 14:05:14 UTC
compile following code; run the result program in /mnt/cephfs (./a.out testfile); umount /mnt/cech; mount /mnt/ceph again; check if 'testfile' size is correct.

include <errno.h>
#include <string.h>
#include <signal.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>

int main(int argc, char* argv[])
        int pipes[2];
        int fd;


        fd = open(argv[1], O_CREAT | O_RDWR, 0666);

        write(pipes[1], "hello", 5);

        splice(pipes[0], NULL, fd, NULL, 5, 0);

        return 0;

Comment 18 Hemanth Kumar 2020-03-05 16:37:01 UTC
Verified the fix in kernel : 3.10.0-1127.el7.x86_64 

Moving to verified.

Comment 20 errata-xmlrpc 2020-03-31 19:18:03 UTC
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.


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